Search Publications
Cluster scaling and its redshift evolution from XMM-Newton
Zhang, Y. -Y.; Finoguenov, A.; Böhringer, H. +4 more
We put together the results of XMM-Newton observations of a number of representative group and cluster samples at low and high redshifts. These results confirm the entropy ramp as an explanation of the observed scaling relations. We observe a mild evolution in the entropy of clusters. The observed degree of evolution is consistent with expectation…
Global structure and composition of the martian atmosphere with SPICAM on Mars express
Bertaux, Jean-Loup; Dimarellis, E.; Forget, F. +26 more
SPectroscopy for the Investigation of the Characteristics of the Atmosphere of Mars (SPICAM) Light, a light-weight (4.7 kg) UV-IR instrument to be flown on Mars Express orbiter, is dedicated to the study of the atmosphere and ionosphere of Mars. A UV spectrometer (118-320 nm, resolution 0.8 nm) is dedicated to nadir viewing, limb viewing and verti…
Analysis of Cluster spacecraft potential during active control
Escoubet, C. P.; André, M.; Décréau, P. M. E. +4 more
The floating potential of a spacecraft is determined by an equilibrium between photo-electron emission from the sunlit spacecraft surfaces and the plasma electron current, while other currents play a secondary role. On the Cluster spacecraft, the presence of the experiment ASPOC to control the potential by an ion beam with currents up to several t…
The response of the near earth magnetotail to substorm activity
Khurana, K. K.; McPherron, R. L.; Thompson, S. +3 more
The large scale structure of the current sheet in the terrestrial magnetotail is often represented as the superposition of a constant northward-oriented magnetic field component ( Bz) and a component along the Earth-Sun direction ( Bx) that varies with distance from the center of the sheet ( z0 in GSM) as in a Hams…
A model grid for the spectral analysis of X-ray emission in young Type Ia supernova remnants
Badenes, Carles; Borkowski, Kazimierz J.; Bravo, Eduardo
We address a new set of models for the spectral analysis of the X-ray emission from young, ejecta-dominated Type Ia supernova remnants. These models are based on hydrodynamic simulations of the interaction between Type Ia supernova explosion models and the surrounding ambient medium, coupled to self-consistent ionization and electron heating calcu…
The temperature structure in the core of Sérsic 159-03
Kaastra, J. S.; de Plaa, J.; Tamura, T. +6 more
We present results from a new 120 ks XMM-Newton observation of the cluster of galaxies Sérsic 159-03. In this paper, we focus on the high-resolution X-ray spectra obtained with the Reflection Grating Spectrometer (RGS). The spectra allow us to constrain the temperature structure in the core of the cluster and determine the emission measure distrib…
Cluster observations of magnetospheric substorm behavior in the near- and mid-tail region
McPherron, R. L.; Dunlop, M. W.; Baker, D. N.
The Cluster constellation of spacecraft has returned substantial new data on particle and field variations in the near- and mid-magnetotail regions of Earth's magnetosphere. Using the Research with Adaptive Particle Imaging Detectors (RAPID) system onboard the four Cluster vehicles, we have identified substorm-related energetic ( E > 20 keV) el…
Reverse convection and cusp proton aurora: Cluster, polar and image observation
Zong, Q. -G.; Daly, P. W.; Mende, S. B. +4 more
On April 21, 2001 an interplanetary CME started to interact with the magnetosphere when CLUSTER spacecraft were travelling in the cusp region. This interaction produced a strong magnetic storm ( Dst = 103 nT) at Earth. Cusp proton aurora was caused by the leading phase of the CME. Cusp proton aurora generally appear during northward IMF…
Solar wind velocity measurements near the sun using Ulysses radio amplitude correlations at two frequencies
Plettemeier, D.; Bird, M. K.; Efimov, A. I. +4 more
Measurements of solar wind velocity have been derived from simultaneous coronal sounding observations of radio amplitude scintillations at both S-band and X-band during the solar conjunction of the Ulysses spacecraft in August 1991. The signal amplitude was recorded with an averaging time of 1 s. A cross-correlation analysis between S- and X-band …
The merging cluster Abell 85 caught between meals by XMM-Newton
Durret, Florence; Lima Neto, Gastão B.; Forman, William
Our XMM-Newton observations of Abell 85 confirm the extended 4 Mpc filament first detected with ROSAT, which has an X-ray temperature of about ∼2 keV and is probably made of groups falling on to the cluster. A comparison of the temperature map with numerical simulations show that Abell 85 had intense merging activity in the past and is not fully r…